Woodworking plane with safety razor blade clamping means



w. KROMER 2,719,554

WOODWORKING PLANE WITH SAFETY RAZOR BLADE CLAMPING MEANS Oct. 4, 1955 Filed Oct. 14, 1955 1W. flmlm.....,

Unit d S at Patsflt .0 73? WOODWORKING PLANE WITH SAFETY RAZOR BLADE CLAMPING MEANS I Wilhelm Kromer, Cleveland Heights, Ohio] Application October 14, 1953, Serial No. 386,003 3 Claims. Cl. 145-16 This invention relates in general to woodworking tools and, more particularly, to rabbet-type planing tools such as used for cutting longitudinal grooves at the edges of boards.: I j

The primary object of the invention is the provision of a rabbet-type plane constructed to use as chisel or iron a narrow steel strip such as a one-edge razor blade, the steel strip being held on the bed of the plane crosswise thereof and having its side cutting edge adjustably extended through the mouth of the plane.

Another object of the invention is the provision of a plane of the type referred to above, in which the steel strip iron is adjustably supported on an offset seating portion of the plane bed and clamped thereto by a clamp ing member seated upon the main portion of the bed and held in clamping engagement therewith, the clamping member being formed at its lower end with a clamping shoe portion extended above the offset seating portion of the plane bed to permit clamping engagement of the shoe portion with the steel strip iron resting on the offset seating portion.

A further object of the invention is the provision of a plane of the type referred to above, in which the seating faces of the main portion and offset portion of the plane bed are angularly related to each other and in which the seating faces of the clamping member and clamping shoe member are angularly related to each other to effect, by a single clamping means, a non-rotatable clamping engagement of the clamping member with the plane bed.

Still another object of the invention is the provision of a plane of the type referred to above, in which the clamping member is forced into clamping engagement with the plane bed by a thimble-like handle member which is threadedly engaged with a threaded stud extended from the plane bed and formed with a coneshaped recess adapted to receive the index finger of an operator when gripping and handling the plane.

With the above and other objects in view, the invention has certain other marked superiorities which clearly distinguish it from presently known structures and arrangements. These improvements or characteristics, embodying certain novel features of construction and design, are clearly set forth in the appended claims and a preferred form of embodiment of the invention as hereinafter shown with reference to the accompanying drawing forming part of the specification.

In the drawing:

Fig. 1 is a plan view of a rabbet-like plane constructed in accordance with the invention;

Fig. 2 is a longitudinal sectional view taken on line 22 of Fig. 1;

Fig. 3 is an end view of the plane shown in Fig. 1;

Fig. 4 is a longitudinal sectional view taken on line 4--4 of Fig. 1;

Fig. 5 is a cross sectional view taken on line 5--5 of Fig. 2;

Fig. 6 is a perspective view of the clamping member;

2,719,554 Patented Oct. 4, 1955 Fig. 7 is a side-view, partly in section, of the thimblelike handle member; and v Fig.8 is a perspective view of the strip-like chisel or iron of the plane.

Referring now more particularly to the exemplified form of the invention shown in the drawing, reference numeral 2 denotes a rabbet plane, the elongated body 3 of which has U-shaped cross section and the sole 4 of which'includes a mouth having the form of a slot 6 extended crosswise of the sole" over the entire width thereof. Body 3 includes side walls 7 which are interconnected by ribs 8 in front and rear portions 9 and 10 of the plane and a bed 11 arranged adjacent to slot 6 in forwardly inclined relation with respect thereto. The bed 11 is formed by a seating portion 12 having a threaded stud 14 extended from the central area-of inclined' seating surface 15 and 'a-chisel or iron seating portion 16, the inclined seating surface 17 of which extends from slot 6 in angular relation to inclined seating surface 15 of main portion 12. Bed 11 furthermore includes two symmetrically arranged threaded bores 18 which extend parallel to inclined seating surface 17 and mount adjusting screw members 19 for adjustably shifting an elongated metal strip 20 which forms the chisel or iron of the plane and is seated upon surface 17 and clamped thereto. Metal strip 20, which has the shape and form of a one-edge razor blade and is readily replaceable thereby, is formed with a cutting edge 21 extended through slot 6 and clamped to seating surface 17 by a clamping member 22 embodying a seating portion 23 and a clamping shoe portion 24 extended downwardly from seating portion 23. The clamping shoe portion 24 extends above seating surface 17 to engage metal strip 20 when clamping member 22, formed with a central perforation 25, is sleeved upon the threaded stud 14 to rest upon inclined surface 15 of bed portion 12 and clamped to said bed portion by a thimble-like handle member 26. This handle member includes a hollow coneshaped head portion 27 and a neck portion 28 which is provided with a threaded axial bore 29 to permit threading of handle member 26 on threaded stud 14. Neck portion 28, near its end 30, includes an axial recess 31 which seats a compression spring 32 adapted to yieldingly force clamping member 22 into engagement with the seating surfaces 15 and 17 when the handle member 26 is loosened to permit adjustment of strip-like iron 20 by actuation of adjusting screw members 19.

The thus constructed rabbet plane, in which side walls 7 opposite slot 6 include large openings 33 facilitating disposal of shavings, is readily manipulated by the operator when the plane is gripped so that the index finger of the operator extends into hollow cone-shaped head portion 27 of the thimble-like handle member. This is of significant importance for proper handling of the plane in planing operations. Adjustment of steel strip iron 20 is readily effected by slight reverse rotation of handle member 26 and rotation of adjusting screw members 19 engaging the rear side edge of the steel strip iron and controlling its proper positioning on inclined seating surface 17 of the plane. The rabbet plane, as previously stated, is constructed to use as steel strip iron a onecutting-edge razor blade, such as used in many safety razors, to eliminate the necessity of grinding and sharpening a dull steel strip iron by inserting a new, sharp one-edge razor blade.

Having thus described my invention, what I claim is:

1. In a woodworking tool an elongated body of U- shaped cross section having a web with an open-ended transverse slot and side walls bridging said slot in elevated position with respect thereto, stationary safety razor blade carrier means integrally formed in said body adjacent said transverse slot embodying a first forwardly inclined seat and a second forwardly inclined seat adjacent said slot in downwardly ofiset relation with respect to the first seat, a clamping plate member removably seated upon said first seat and formed with a forwardly and downwardly extended clamping shoe portion extending above the second seat and clamping means to 'clamp a safety razor blade between the shoe portion and the second seat.

2. A woodworking tool as described in claim 1, wherein the safety razor blade carrier means include a threaded post extended upwardly from the first seat, wherein the clamping plate member includes a hole receiving said post, wherein a nut member threaded on said post forces the clamping plate member onto the first seat, and wherein the first and second seats extend in planes angularly related to each other to non-rotatably secure the clamping plate member in its safety razor blade clamping position to the safety blade carrier.,

3. A woodworking tool as described in claim 2, wherein the threaded post extends from the first seat in for- 4 wardly and upwardly inclined direction to the longitudinal axis of the body of the tool, and wherein the nut member includes a cone-shaped head portion arranged to receive for guiding purposes the tip of the sharply bent index finger of an operator gripping the body of the tool for holding same in working operations.

References Cited in the file of this patent UNITED STATES PATENTS 203,442 Griflen May 7, 1878 293,863 Goldborough Feb. 19, 1884 741,994 Taylor Oct.- 20, 1903 835,160 Lutz et al Nov. 6, 1906 886,750 White May 5, 1908 892,052 Hildreth June 30, 1908 2,380,186 Mayer July 10, 1945 2,418,638 Hoover Apr. 8, 1947 2,648,363 Weber Aug. 11, 1953 FOREIGN PATENTS 616,574 Great Britain Jan. 24, 1949 

